Ring Rotations in Polystyrenes

The ring rotations generate total angular displacements of about 40° (for substituents in the ortho position) to 70° (for bulky non-polar substituents in the para position). 

We have chosen motion about the C2 axis to model ring motion in polystyrenes. We acknowledge that these motions are likely to be more complicated than just C2 rotations. 

However, the motions are small amplitude. Small-amplitude wiggling can equally well be modeled by aromatic CH motion on a circle or sphere, or by C2 rotations. Thus, any of these 

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